Antenna



FIG. 1 is a top plan view of an antenna, showing our new design;

FIG. 2 is an enlarged right side elevation view thereof;

FIG. 3 is an enlarged left side elevation view thereof;

FIG. 4 is a front elevation view thereof;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a top perspective view thereof.

The broken lines in the drawings depict environment only and form no part of the claimed design. 

CLAIM The ornamental design for an antenna, as shown and described. 